<template>
	<view>
		<my-search @gotoSearch="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滚动区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh +'px'}">
				<block v-for="(item,index) in cateList" :key="index">
				<view @click="activeChange(index)" :class="['left-scroll-view-item',index == active?'active':'']">{{item.cat_name}}</view>
				</block>
			</scroll-view>
		<!--右侧滚动区 -->
			<scroll-view :scroll-top="scrollTop" class="right-scroll-view" scroll-y="true" :style="{height: wh +'px'}">
			<view class="cate-lv2" v-for="(item2,index2) in catelevel2" :key="index2">
				<view class="cate-lv2-title">
					 {{item2.cat_name}} 
				</view>
				<!-- 三级分类列表 -->
				<view class="cate-lv3-list">
					<view @click="gotoGoodsList(item3)" class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3">
						<image :src="item3.cat_icon"></image>
						<text>{{item3.cat_name}}</text>
					</view>
				</view>
			</view>
		
		</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//可用窗体高度
				wh:0,
				// 激活项
				active:0,
				//分类列表
				cateList:[],
				// 二级分类列表
				catelevel2:[],
				// 滚动条位置
				scrollTop:0
			}
		},
		methods: {
		async getCateList(){
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.catelevel2 = res.message[0].children
			},
			activeChange(index){
				this.active = index
				this.catelevel2 = this.cateList[index].children
			// 重置滚动条位置,不能直接等于0，重置会失效
			this.scrollTop = this.scrollTop === 0 ? 1:0
			},
			// 跳转商品列表页
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			// 跳转搜索页
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
			
		},
		onLoad(){
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		}
		
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}
.left-scroll-view{
	flex:1;
	view{
		background-color: #f7f7f7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
	}
	.active{
		background-color: #ffffff;
		position: relative;
		&::before{
			content: ' ';
			display: block;
			width: 2px;
			height: 30px;
			background-color: #C00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}
.right-scroll-view{
	flex:3
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		image{
			width: 60px;
			height: 60px;
		}
		text{
			text-align: center;
			font-size: 12px;
			padding:8px 0;
		}
	}
}
</style>
